Example sentences of "if they have [not/n't] [adv] been " in BNC.

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1 ‘ You ca n't read them if they 've not yet been written ! ’
2 A much more significant straw , however , was the direct military involvement in August 1964 of United States military forces in Vietnam , which led to Australian and New Zealand military contingents being provided and might have attracted British troops as well , if they had not already been committed in Borneo and the Aden Protectorates .
3 Monsieur Truffer confirmed to us that the crew must have died instantly — if they had not already been killed by the anti-aircraft fire .
4 He is by no means as feeble as he appears , and the Homunculi will appear from area 65 to fight with him if they have not already been destroyed .
5 Erm I I 've done a lot of listening this evening er and I 'm sure you have too from from the way in which the the rest of the board have been responding er with there eyes and ears even if they have n't always been open .
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